Electrical regulating apparatus.



G. LAMBCEUF.l

ELECTRICAL REGULATING APPARATUS. APPLICATION FILED JAN.13, 1911.

1,051,238. Patented .11111211913 2 SHEETS-#HEBT 1.

y l fave/li- G. LAMBCEUF.

ELECTBIGAL REGULATING APPARATUS.

APPLCATION FILED JAN,13, 1911.

1,051,288. Patented l12111.21, 1913.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

oHARLEs LAMBcEUF, or BELFORT, TRANCE, AssIGNoR To SOCIT ALSAGIENNE DE ooNsTRUcTIoNs McANIoUEs, or BELFORT, FRANCE.

ELECTRICAL REGULATING APPARATUS.

T0 all whom t may concern:

Be it known that I, CHARLES LAMBCEUF, a citizen of the French Republic, and resident of Belfort, France, have invented cer tain new and useful Electrical Regulating Apparatus, of which the following is a specification.

It is a well known fact that in a dynamo electric machine the electromotive force only follows with a certain delay the variations produced in the tension of excitation by the control apparatus (field rheostat for instance). This delay is caused by the self induction of the circuit of excitation of the machine. Itl is often very important to reduce as unich as possible this delay. This is for instance the case in the starting generators of the reversible motors of rolling mills; it is then necessary` 'to be able to vary and completely reverse in a minimum soace of time the Velectromotive force of the generator in order to increase as much as p0ssible the output of the rolling mill.

This invention relates to a process which allows to reduce this delay.

The j method on which this process is based consists in producing` automatically at vthe terminals of the winding of excitation of the machine, a variation of tension which is greater than that which would be necessary for obtaining the required variation of the electromotive force. This tension is also automatically brought back to its normal value as soon as the desired electromotive force is attained.

In the drawing, Figure 1 is a diagram illustrating my invention; Fig. 2 is a similar view, showing an Iadditional coil on the booster; Fig. 3 is a diagram the same as Fig. 1 except for the location of the rheostat; and, Fig. 4c is a diagram the same as Fig. 1 except for the connection of the exciting coil of the booster.

In the drawing similar elements are indicated by similar reference letters.

Referring first to Fig. 1, A represents the dynamo electric machine in which it is desired to rapidly produce .a given yelectromotiveforce, and B is the main field winding of the dynamo, the circuit offthis winding extending to a suitable source of current, indicated by the conductors C, the potential of this source being such as to cause Specification of Letters Patent.

Application led January 13, 1911.

Patented Jan. 21, 1913.

serial No. 602,420.

normal excitation of the field B of the dynamo.

Arranged in series relation with the winding B is the armature F of a voltage increasing or reducing dynamo provided with two windings of excitation G and H the ampere-turns of which partially or entirely neutralize each other when the desired electromotive force is attained in A. It will be supposed first that the said ampere-turns neutralize each other entirely; thereafter the case will be treated where they neutralize each other only partially. The winding G isconnected with the terminals of main field B and arranged in such a manner that it causes F to work so as to increase the voltage while H which is connected with the terminals of the machine A has a tendency to cause F to work so as to reduce the voltage. The booster F is always a small one and consequently its windings of excitation only produce a weak self induction. Y

The function is as follows: It will be first supposed that the rheostat D being adjusted according to the electromotiveforce to be obtained in A, the switch E is closed. By reason of what has just been said of the machine F the current corresponding to the tension which is applied to it; at once establishes itself in the winding G. In any case the current will 'establish itself in G much more rapidly than in H as the tension at the terminals of this windingr has the same delay as the electromotive force of the machine A. The machine F will then work so as to increase the voltageand B is subjected at the beginning to the sum of the tension of the source C and that furnished by the booster F. .It will be observed that theY winding G is itself subjected to the sum of the said two tensions whereby its action is still increased and the voltage of B still more reinforced. As readily seen the current circulating in B will rapidly increase owing to the surplus voltage which is applied thereto and, at the same time, the electroniotive force of the machine IA and consequently the tension at the terminals of the winding H will rapidly increase. The ampere-turns of H will therefore increase whereby the tension furnished by F will be gradually reduced. Finally when the clectromotive tore attains in A the dcsired value, the etlectlzof the booster F be comes null as the ampere-turns of G and Il neutralize each other. rlhe action ot the device may be rendered more energetic by maintaining during a large party ot the time necessary tor establishing the electromotive force, a high over-voltage in B. It will be sufficient to attain this object, that the mag netic circuit of the booster F be such that at the beginning the magnetizing ampereturns of G saturate it strongly, as long as this saturation will exist, the over-voltage of B will be maintained sensibly in spite ol. the increase ot the ampere windings ot Il.

It a. certain electromotive torce is established at and the rheostat D is actuatedv so as to cause it to be varied, the machine F again starts working. It' the tension applied to B is increased z'. c. it it is desired to increase the eltatromotive torce o't` A, the winding (it becomes preponderant and the.

Y booster I" works so as to increase the voltage and increase the voltage olE the winding B.

It on the contrary the rheostat I) is actuated so as to reduce the clectromotive force ot A, the ampere turns ot' II will be preponderant, as the tension at the terminals of decreases only slowly, the dynamo lt worlts so as to reduce the voltage and reduces still further thc tension applied at B. thusy accelerating the diminution ot the electr-emotive force. In both cases. the rapidity o'tl the action ot the machine. F is still increased by the variation ot the tension which its 'function produces at the terminals of the winding G. as readilyunderstood the function ot this device is absolutely automatic. At each variation which it is desired to produce in the electromotive torce of the main machine, one has automatically at one`s disposal at the terminals of its circuitI of excitation a variation of tension which is-grcater (in any given proportion) than that which would be necessary. Automatically again, the tension existing at the terminals ot' the exciting circuit returns to its normal value as soon as the electromotive power is attained. The time required for establishing a given electromotive force will depend upon the working conditions of the machine A. It is needless to say that the variation of the electromotive force which may be obtained may attain the complete reversing as in the case of reversible rolling mills where the reversing of the direction of working is obtained b y reversing the tension at the terminals of the. starting dynamos. It may, in certain cases, be advantageous to proportion the windings G and H so that they will not neutralize one another when the electromotive force of the machine A is normal, or equal to that which it generates when the eld B is excited by the source C alone. In that case, the

booster will operate to maintain a potential at the terminals ofthe coil B which is higher or lower than theI voltage of the source C according to which ot the coils, G or II,

would prepcnderate at the normal voltage otl the niachine A.

.lhe winding G on the booster, instead of being connected in shunt only to the main winding G of the generator A, as shown in Figs. l, 2 and 3, can be connected in shunt to the booster armature F, as well as said winding B, as shown in Fig. 4. lith this arrangement the voltage at the terminals ot the .vint'ling G is no-t increased by the action ot the booster, but the arrangement may be satisfactoril)Y used where the booster is small and the. seit induction of the coil Gr will not prevent the current from rapidly energizing the coil. 'ith this arrangen'ient the voltage at the terminals of the coil G is constant. for any given position of the arm of the rheostat, but the voltage and current in the coil II. will vary with any change in electromotive torce at the terminals et' the machine A, and this will cause the booster to operate to increase or decrease the voltage at the terminalsl ot the lield winding B in accordance with the decrease or increase in the electr-emotive force otl the machine A. It will now be supposed that`the electromotive torce ot the machine variesI for any possible cause. Immediatelj.Y the action oi the ampere turns of the winding II of thc booster IC will vary in the same sense. The booster' starts working and automatically modifies the tension at the terminals ot' B until the equilibrium is again established between the an'ipere-turns of the winding G and those of the winding I'I that is to say until the eleetromotive torce ot A has again assumed its original value. The device will theretore work as an automatic tension controller. The rheostat D, may be placed in series with the booster armature and the lields G and B, as shown in Figs. l and 4l, or it may be inserted in series only with said armature and the winding- G, as indicated at. K, Fig. 3. This latter arrangement is more economical because the current for the field B does` not pass through the rheostat.

In Fig. 2 of the drawing I have illustrated a modification suitable for relieving the machine A from the injurious etlect of sudden changes in load, or, in other words, for deadening the shock to the machine which comes from such sudden changes in load. In this ligure the arrangement of circuits is the same as in Fig. l, with the coils I and J added. The coil I is an inductive resistance arranged in the main circuit L, and which opposes any sudden change in the rate ofr current How in said circuit, and the coil J is arranged on the booster and its terminals are connected to the terminals of the coil I, as shown. Any change in the rate of cur- Yrate of change will flow thro-ugh the coil J,

which coil will be arranged upon the booster to assist or oppose the coil ll, accordingly as the machine A is a dynamo or a motor, and the booster Will .operate to cause a higher or lower voltage, as desired, at the terminals of the coil B. Thus ,a dampeniug of the -current fiow in the circuit L and a variation in the eld B will be produced Which ivill relieve the machine A from injurious shocks.

The arrangement shown in the present case has the advantage of being very rapid in action. It will be understood, however, that if the shock deadening coils are used, the booster Will not maintain a constant Voltage in the machine A, as the coil J, when active, would destroy the equilibrium between the coils Hand G. It is needless to say that the machine F may be actuated in any suitable manner, and that the source of current C and the controlling apparatus may be of any suitable kind.

Having now fully described my said in vention, what I claim and desire to secure by Letters Patent, is zv 1. The combination With a current source, of a dynamo electric machine having a main field Winding connected' to said source for separate excitation, a booster having its armature connected to said source and in series with said main field, for over-exciting the latter, and a field coil in circuit With the armature of said dynamo elect-ric machine for reducing the voltage of the booster.

2. The combination With a current source, of a dynamo electric machine having a main field Winding connected to said source for separate excitation, a booster having its armature and energizing field connected to said source, the armature of said booster being connected in series With said main field Winding and adapted to over-excite the same, and a field coilin circuit with the armature of said dynamo electric machine for reducing the voltage of the booster.

3. The combination With a current source, of a dynamo electric machine having a main field Winding connected tol 'said source for separate excitation, a booster having lits armature and, energizing field connected to said source, the armature of said booster being connected in series With said main field winding and adapted to over-excite the same, the energizing field of the booster being in series with the booster armature and in shunt to said main field, and a field coil in circuit With the armature of said dynamo electric machine for reducing the voltage of the booster.

4. The combination With a current source, of' a dynamo electric machine having a main field Winding connected to said source for separate excitation, a booster having its armature and energizing field connected to said source, the armature of said booster being connected in series With said main field Winding and adapted to over-excite the same, the energizing field of the booster being in series with the booster armature and in shunt to said main field, a rheostat in series with the booster armature its energizing field and said main field, and a field coil in circuit With the armature of said dynamo electric lmachine for reducing the voltage of the booster.

5. The combination With a current source, of a dynamo electric machine having a main field Winding connected to said source for separate excitation, a booster having its armature connected to said source and in series With said main field, for over-exciting the latter, a rheostat in series with the booster armature, and a field coil in circuit with the armature of said dynamo electric machine for reducing the voltage of the boos ter. 6. The combination With a current source, of a dynamo electric machine having a main field Winding connected to said source for separate excitation, a booster having its armature and energizing field connected to said source, the armature of said booster being connected in series with said main field winding, and adapted to over-excite the same, a. rheostat in series with the armature and energizing field of the booster, and a field coil in circuit'with the armature of said dynamo electric machine for reducing the voltage of the booster.

In testimony whereof I have hereunto set my hand in presence of two Witnesses.

CHARLES LAMBGUF.

Witnesses:

JAENNE VIQET, J. BUNOT. 

